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数据库users包含的字段有Id(int)、data(varchar)、create_date(Timestamp) 1.工具类DatabaseUtils 实现加载驱动、获取连接、释放连接资源 private static final String DRIVER = "com.mysql.cj.jdbc.Driver"; private static final String URL = "jdbc:mysql://localhost:3306/users?characterEncoding=UT